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GPV02 series gas proportional valve is a kind of movable permanent magnet type electromagnetic proportional valve, which can set the valve opening according to the size of the control current applied, and can be continuously adjusted in a small and stepless manner with the change of the controller current, which can be adjusted to the required gas output pressure immediately. It also has a pressure stabilizing mechanism, which can automatically adjust the valve opening when the input pressure changes, so that the combustion condition is always in a stable state. In this way, the controller can output different regulation current to proportional valve through the water temperature feedback signal, so as to realize automatic regulation of the gas flow and achieve the purpose of regulating water temperature and stabilizing water temperature. The valve also has the function of slow ignition. It can set different ignition current according to the power of the gas, which can effectively prevent ignition explosion. This series of valves have good regulating performance, sealing performance and compact structure, which are suitable for high power gas water heaters and combine gas boilers.